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  1. Gary Tollison

    Resistivity equations

    Hi folks. I'm getting ready for some upcoming exams and I find myself tripping up over resistivity equations. I've been working through example questions, but this one confuses me. Example: Find the CSA of a single copper cable 500 metres long, which carries a current of 2.5A, and has voltage...
  2. Gary Tollison

    Can a dimmer switch be used to control drill speed?

    Used as a variable speed controller
  3. Gary Tollison

    Can a dimmer switch be used to control drill speed?

    Hello As the title says... ;) I'm thinking about having a 1.8A 400V bushed fixed speed drill, mounted in a press, connected to a dimmer switch to control the drill speed. Any ideas, or advice? And please, to those who think I'm silly to think such an idea etc, I can do without the criticism...
  4. Gary Tollison

    Consumer unit: which comes first?

    Hello again. well, I must apologise if this is not the correct area for this post! A thank you to those who have helped. :)
  5. Gary Tollison

    loop impedance, temperature, cable factor....

    Hello I'm not sure if this is the correct forum area to post this in, apologies if it isn't... I've been working through some mock questions on-line, and found myself confused by this: The measured value of loop impedance for a circuit is 0.83ohm. If the temperature at the time of the test was...
  6. Gary Tollison

    Consumer unit: which comes first?

    Apologies for not providing more info. Have no fear, I am certainly not a cowboy when it comes to electricity! In fact, I'm only just into my second year studying to be a domestic electrical installer, then planning on moving up to commercial/industrial. I'm asking this as after having...
  7. Gary Tollison

    Consumer unit: which comes first?

    greetings. Just a quick question about switch order. Should the main circuit breaker be wired in first before the main switch, or is the main switch always first in line from the supply feed? Thanks, Gary
  8. Gary Tollison

    Part P defined scope enquiry

    Greetings I will be attending the second practical week of my Domestic Electrical Installer course soon. C&G 2365 Unit 201/501 - Health and safety in Building Services Engineering. Certified outcomes: Part P Defined Scope. Does this mean that I would be able to apply for some kind of...
  9. Gary Tollison

    City & Guild Exam certificates

    Greetings I have just attended my first practical week at my training centre and have passed the C&G 2365-501 Health & Safety in Building Services and Engineering. I got the exam report from my tutor, but was wondering if I'll be receiving any kind of certificate from City & Guild? Thanks in...
  10. Gary Tollison

    Electrician workwear

    Thanks for the comments! :) Went shopping today and got black cargo pants, not too many pockets though Gloves are next on the list, got some in mind too!
  11. Gary Tollison

    Electrician workwear

    greetings Just thought I'd get opinions on workwear. I already have steel cap boots, eye protection, hi-viz etc, but what would be the ideal shirt and trousers for a sparky to wear? :)
  12. Gary Tollison

    earth fault loop impedance

    I makes no mention of either
  13. Gary Tollison

    earth fault loop impedance

    that hurt my brain! :D The reason I am asking is I am having a go at a practice theory question, which is: 1. The following measured values of loop impedance were recorded for six circuits in an installation. Each circuit is protected by a BS EN 60898 type B cb. Referring to the maximum...
  14. Gary Tollison

    earth fault loop impedance

    Hello :) I'm confused about EFLI which I am guessing should be relatively straight-forward. I can't get my tired brain to figure out how to calculate the value for EFLI on system-side circuits? eg: what should the actual calculated value be for a 40A circuit, and how do I get that figure...
  15. Gary Tollison

    Electrician Jobs Electrical student needing help :)

    Hello Quick introduction. I am a 43 year old New Zealand chap been living in Peterborough for 3 1/2 years. I am studying via distance learning to become a qualified electrician. Until I am actually "out there, doing hands-on", everything I have learned so far is just floating around in my...
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